Low-cycle fatigue behavior of TWIP steel - Effect of grain size

被引：8

作者：

Ruesing, Christian Johannes ^{[1
]}

Niendorf, Thomas ^{[1
]}

Frehn, Andreas ^{[2
]}

Maier, Hans Juergen ^{[3
]}

机构：

[1] Univ Paderborn, Lehrstuhl Werkstoffkunde Mat Sci, Pohlweg 47-49, D-33098 Paderborn, Germany

[2] Product Grp Chassis Components & Modules, Benteler Automot, D-33102 Paderborn, Germany

[3] Leibniz Univ Hannover, Inst Werkstoffkunde, D-30823 Hannover, Germany

来源：

11TH INTERNATIONAL FATIGUE CONGRESS, PTS 1 AND 2 | 2014年 / 891-892卷

关键词：

Twinning; low-cycle fatigue; microstructure; grain size; high manganese steel; INDUCED PLASTICITY STEELS; DEFORMATION; MECHANISMS; ENERGY;

D O I：

10.4028/www.scientific.net/AMR.891-892.1603

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The effect of different grain sizes on the fatigue performance of high manganese TWIP steel (Twinning-Induced Plasticity) in the low-cycle fatigue regime was investigated. The average grain sizes in the fine grained condition were 2 5 mu m and after heat treatment in the coarse grained condition about 80 mu m were obtained. Pronounced twin-dislocation interactions especially in small grains strengthen the steel during monotonic deformation. Twin boundaries act as obstacles for dislocation slip, and thus, further reduce the effective grain size, which affects the fatigue response as well. The samples were monotonically and cyclically deformed at room temperature. The results reveal that the gain size has a significant influence on the mechanical as well as on the cyclic performance. Especially under cyclic loading differences in the resulting stress levels and cyclic stability can be observed. To clarify the microstructure evolution before and after fatigue with different constant strain amplitudes the samples were analyzed by means of transmission electron microscopy (TEM).

引用

页码：1603 / +

页数：2

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